Optical member and lighting device using the same

ABSTRACT

Provided are an optical member capable of implementing optical images having desired shapes through a pattern design, and a lighting device using the optical member, the optical member including: a base substrate; multiple patterns sequentially arranged on a first surface of the base substrate and having inclined surfaces with an inclination angle with respect to the first surfaces; and a reflective portion on the base substrate or the multiple patterns, wherein the multiple patterns implement a line shaped beam of a first path crossing at right angles to respective pattern extension directions of the multiple patterns by guiding a first incident beam into a first surface direction toward which the first surface looks or a second surface direction toward which a second surface of the base substrate opposite to the first surface looks, through refraction or reflection from the inclined surfaces.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority under 35 U.S.C. §119 to KoreanApplication No. 10-2013-0164890 filed on Dec. 27, 2013, in the KoreanIntellectual Property Office, whose entire disclosure is herebyincorporated by reference.

BACKGROUND

1. Field

Embodiments of the present disclosure relate to an optical membercapable of implementing an optical image having a desired shape bycontrolling an optical path, an optical width and luminous intensitythrough a pattern design through a pattern design, and a lighting deviceusing the same.

2. Background

In general, a lighting device is a device used for lightening a darkplace using various light sources. The lighting device is used to shinea beam at a specific object or space and to express an atmosphere of thespecific object or space in a desired shape or color.

According to the technical development of an LED (Light Emitting Diode),lighting devices in various shapes using the LED have recently come intowide use. For example, one of the lighting devices according to aconventional art includes a diffusion plate for emitting light emittedfrom LED light sources to the outside.

Most of the LED lighting devices according to the conventional art areconfigured so that light is uniformly outputted on an entire lightemitting surface. Also, in order to express the atmosphere of a specificobject or space in a desired shape or color, a color filter or a filterhaving a light permeable hole in a desired shape has been used in somelighting devices according to the conventional art.

However, when the atmosphere of a specific object or space is expressedin a desired shape or color using the LED lighting devices according tothe conventional art, the configuration of the devices becomesmechanically complicated, and as a result, it is problematic in that thedegree of freedom in design is limited, and it is difficult to installor maintain and manage the devices. As such, in order to express theatmosphere in a desired shape or color or an optical image, a lightdevice having a simple structure, which is easy to install or maintainand manage, has been required.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments will be described in detail with reference to thefollowing drawings in which like reference numerals refer to likeelements wherein:

FIG. 1 is a perspective view of an optical member according to anembodiment of the present disclosure;

FIG. 2 is a cross-sectional view and a partially enlarged view of theoptical member of FIG. 1;

FIG. 3 is a view for explaining the principles of refraction andreflection of an incident beam generated from patterns of the opticalmember of FIG. 1;

FIG. 4 is a view for explaining the principles of generation of a lineshaped beam using the optical member of FIG. 1;

FIG. 5 is a view showing brightness for each area regarding the lineshaped beam of the optical member of FIG. 1;

FIG. 6 is a view for explaining a pattern structure of the opticalmember of FIG. 1;

FIG. 7 is a view for explaining another example for the patternstructure of the optical member of FIG. 1;

FIG. 8 is a view for explaining a further example for the patternstructure of the optical member of FIG. 1;

FIG. 9 is a plan view of an optical member according to anotherembodiment of the present disclosure;

FIG. 10 is a cross-sectional view of the optical member according toanother embodiment of the present disclosure;

FIG. 11 is a cross-sectional view of a modification example for theoptical member of FIG. 10;

FIG. 12 is a plan view of a lighting device according to an embodimentof the present disclosure;

FIG. 13 is a plan view of a lighting device according to anotherembodiment of the present disclosure;

FIG. 14 is a schematic cross-sectional view of the lighting device ofFIG. 13 taken along line XIV-XIV;

FIG. 15 is a view showing an operational status of the lighting deviceof FIG. 13;

FIG. 16 is a graph showing measured brightness of the lighting device ofFIG. 15;

FIG. 17 is an operational status view of the lighting device accordingto another embodiment of the present disclosure;

FIG. 18 is a partially enlarged cross-sectional view of a structurewhich can be applied to the lighting device of FIG. 17;

FIG. 19 is a plan view of a reflective pattern which can be applied tothe lighting device of FIG. 18;

FIG. 20 is a partially enlarged cross-sectional view of a structurewhich can be applied to the lighting device of FIG. 17;

FIG. 21 is a cross-sectional view of a lighting device according to afurther embodiment of the present disclosure; and

FIG. 22 is a plan view of a lighting device according to yet anotherembodiment of the present disclosure.

DETAILED DESCRIPTION DISCLOSURE

Hereinafter, the embodiments of the present disclosure that an ordinaryperson skilled in the art can implement will be described with referenceto the accompanying drawings. The embodiments in the specification andthe constructions shown in the drawings are provided as a preferredembodiment of the present disclosure, and it should be understood thatthere may be various equivalents and modifications which couldsubstitute at the time of filing. In addition, when it comes to theoperation principle of the preferred embodiments of the presentdisclosure, when the known functions or functions are seemed to makeunclear the subject matters of the present disclosure, they will beomitted from the descriptions of the disclosure. The terms below aredefined in consideration of the functions of the present disclosure, andthe meaning of each term should be interpreted by judging the wholeparts of the present specification, and the elements having the similarfunctions and operations of the drawings are given the same referencenumerals.

FIG. 1 is a perspective view of an optical member according to anembodiment of the present disclosure. FIG. 2 is a cross-sectional viewand a partially enlarged view of the optical member of FIG. 1.

Referring to FIGS. 1 and 2, an optical member 100 according to thepresent embodiment is configured to include: a base substrate 10; athree-dimensional effect forming portion 11; and a reflective portion12. The three-dimensional effect forming portion 11 includes multiplepatterns 111 sequentially arranged on a first surface of the basesubstrate 10, and each of the multiple patterns has an inclined surface113 having an inclination angle with respect to a first surface.

The base substrate 10 is formed with a transparent substrate. The basesubstrate 10 may be made of a material having a haze of 2% or less.Also, it is preferable that a light transmittance of the base substrate10 be 80% or more, but is not limited thereto. For example, the lighttransmittance of the base substrate 10 may be selected from the range ofabout 60% or more according to a desired shape upon implementing opticalimages of a line shaped beam, a three-dimensional effect beam or a lineshaped beam with a three-dimensional effect. When the lighttransmittance of the base substrate 10 is smaller than 60%, it may bedifficult to properly express a line shaped beam or a three-dimensionaleffect beam.

The base substrate 10 has the first surface and a second surfaceopposite to the first surface. When the base substrate 10 is provided ina plate or film form, the first surface and the second surface refer totwo surfaces (both surfaces) roughly parallel to each other having arelatively wide area compared to the other surfaces of the basesubstrate 10. The first surface may be referred to as a first mainsurface or a pattern arrangement surface 112.

The base substrate 10 may be made of a polymeric material such as resin,glass or the like. A material of base substrate 10 may be athermoplastic polymer or a photocurable polymer. Also, the material ofthe base substrate 10 may be polycarbonate, polymethylmethacrylate,polystyrene or polyethylene terephthalte, but is not limited thereto.

A refractive index of the base substrate 10 may range from about 1.30 to1.80. Also, according to some embodiments, a refractive index of thebase substrate 10 may range from about 1.80 to 2.5. In this case, eachof the inclined surfaces 113 of the multiple patterns 111 may beprovided so as to have a fixed inclination angle according to eachrefractive index of the base substrate 10. The inclined angle may be anangle formed by the pattern arrangement surface 112 of the basesubstrate 10 and the inclined surface 11, or an angle formed by astraight line or a plane being at right angles to the patternarrangement surface 112 and the inclined surface 113.

The multiple patterns 111 of the three-dimensional effect formingportion 11 implement a line shaped beam of a first path being at rightangles to respective pattern extension directions (x-directions) of themultiple patterns by guiding a first incident beam into a first surfacedirection toward which the first surface of the base substrate 10 looks,or a second surface direction toward which the second surface looks byusing refraction or reflection of the respective inclined surfaces 113of the multiple patterns.

Here, the aforesaid inclined surface 113 is provided so as tosubstantially limit spread reflection of the incident beam and to havelittle light returning to an incident angle. That is, the inclinedsurface 113 is provided so as to substantially guide the incident beaminto a predetermined direction using refraction and regular reflectionof the incident beam.

The aforesaid line shaped beam refers to a beam guided and concentratedso that light irradiated to a hemispherical area including thethree-dimensional effect forming portion 11 can have a fixed width(optical width) in the first path and can form a bright portion (a lineshaped bright portion) that has a length longer than the optical widthand is brighter beyond dozens of times compared to peripheral areas. Theguided and concentrated beam means that the light of a predeterminedoptical path according to a position of a standard point or an observingpoint in a light effective area of the light sources is relativelyclearly seen compared to the light of peripheral areas. A lengthdirection of the line shaped beam may be parallel to a y-direction. Thatis, in the present embodiment, the first path may refer to an opticalpath of light traveling in the y-direction.

Also, the first surface direction and the second surface directiondescribed above refer to two directions toward opposite sides to eachother in the thickness direction of the base substrate 10 with the basesubstrate 10 therebetween. That is, the first surface direction mayrefer to an arbitrary direction toward an upper space (an upper part ofthe ground) facing the first surface in the first surface, and thesecond surface direction may refer to a direction toward a lower space(a lower part of the ground) facing the second surface in the secondsurface.

Also, the pattern extension direction described above are a direction inwhich a specific straight line on the inclined surface extends, or adirection in which a specific tangent line in contact with a curved lineon the inclined surface extends. The pattern extension direction isdesigned so as to limit and guide an optical path of light emitted fromthe light source for irradiating the light to the multiple patterns 111into a desired direction, namely, the first path. That is, the patternextension direction of each of the multiple patterns may be provided toextend in a direction that is roughly parallel to the patternarrangement surface and meets at right angles to the first path.

The reflective portion 12 is provided on the second surface of the basesubstrate 10. The reflective portion 12 may be provided so as tocompletely or partially prevent an incident beam inside the basesubstrate 10 from being irradiated to the outside of the second surfaceby passing through the second surface. That is, the reflective portion12

That is, the reflective portion 12 is operated to reflect internal lightof an incidence angle capable of passing through the second surface ofthe base substrate 10 by being refracted and reflected by the multiplepatterns 111 so that the internal light can travel to the patternarrangement surface 112 of the base substrate 10 where the multiplepatterns 111 are positioned.

The reflective portion 12 may be formed of a coating layer or a filmhaving a refractive function. Ag, Al and the like may be used as amaterial of the reflective portion 12.

In a case where the reflective portion 12 is used, the visibility of aline shaped beam may be improved when implementing the line shaped beamhaving a three-dimensional effect through the three-dimensional effectforming portion 11. Also, according to a pattern design of thereflective portion 12, optical images of the line shaped beam may bevariously changed.

The line shaped beam with the three-dimensional effect will be describedin greater detail with reference to FIG. 2 as follows.

As illustrated in FIG. 2, the multiple patterns 111 are operated asindirect light sources in which optical paths become longer in order asa distance from the light source LS increases gradually, therebycreating a three-dimensional effect beam in a thickness direction(z-direction) of the base substrate 10. The thickness direction of thebase substrate 10 may be a direction which meets at right angles to thepattern extension direction (x-direction) and the first direction(y-direction).

In other words, when the multiple patterns 111 include first patterns,second patterns and third patterns in a first area A1, a second area A2and a third area A3 sequentially arranged from the light source LS, asecond optical path of the second patterns is longer than a firstoptical path of the first patterns and is shorter than the third opticalpath of the third patterns. a second distance L2 from a second dummylight source LS2 of the light sources by inclined surfaces of the secondpatterns to the inclined surfaces of the second patterns is longer thana first distance L1 from a first dummy light source LS1 of the lightsources by inclined surfaces of the first patterns to the inclinedsurfaces of the first patterns, and is shorter than a third distance L3from a third dummy light source LS3 of the light sources by inclinedsurfaces of the third patterns to the inclined surfaces of the thirdpatterns. According to such a configuration, the multiple pattern 111implement three-dimensional effect beams showing a form in which anoptical path increases as a distance from the light source increasesgradually in a length direction of the line shape beam, and accordingly,as viewed from an arbitrary point (a standard point or an observingpoint) in a direction roughly vertical to the first surface or thepattern arrangement surface, the distance from the light sourcesincreases as the optical path increases gradually.

The second patterns may be patterns positioned right after the firstpatterns on the pattern arrangement surface 112 as viewed from the lightsource LS or may be patterns positioned with the first patterns andother patterns in a predetermined number therebetween. Similarly, thethird patterns may be patterns positioned right after the secondpatterns on the pattern arrangement surface as viewed from the lightsource LS, or may be patterns positioned with the second patterns andother patterns in a predetermined number therebetween.

Also, the aforesaid three-dimensional effect beam may refer to anoptical image having a form (perceptional depth) in which a line-shapebeam of a predetermined optical path (the first path) gradually entersthe base substrate 10, namely, from the first surface of the basesubstrate 10 toward the second surface of the base substrate 10, asviewed from the first surface direction or the second surface direction.Furthermore, the three-dimensional effect beam may be one example of aline-shaped beam and may be another name for a specific optical image ofthe line-shaped beam.

Also, according to the present embodiment, the multiple patterns 111 areprovided by removing a part of the first surface of the base substrate10, but the present disclosure is not limited to the configuration. Thatis, according to some embodiments, the multiple patterns 111 may beprovided by a separate pattern layer disposed on the first surface ofthe base substrate 10. When the multiple patterns 111 intended forguiding an incident beam into the first surface direction or the secondsurface direction by refracting and reflecting the incident beam via theinclined surface 113 having the predetermined surface roughness areused, an optical path, an optical width and luminous intensity of theincident beam can be controlled, and accordingly, the optical imageshaving desired shapes of line shaped beam, three-dimensional effect beamor line shaped beams with a three-dimensional effect beam having desiredshapes can be implemented.

In order to implement optical images of the line shaped beams with athree-dimensional effect through a pattern design, the inclined surface113 of each of the multiple patterns 111 may be provided as amirror-like finishing surface or a precision processing surface. Thatis, the inclined surface 113 has a surface roughness beyond a fixedstandard as a smooth surface.

In the present embodiment, even though there is a slight differenceaccording to each processing method, the inclined surface 113 may have aroughly center line average roughness or an arithmetic mean roughness Raof 0.02 or less, and a maximum height roughness Rmax of 0.3 or less.According to some embodiments, the surface roughness of the inclinedsurface 113 may be a ten point median height Rz of 0.8 or less. Here,the unit of roughness may be μm, and a standard length may be 0.25 mm.

The configuration of the inclined surface 113 is intended to secure areflectance of the inclined surface in a range beyond a predeterminedvalue. When the surface roughness shows a larger surface roughness thanthe value described above, it is difficult to properly implement a lineshaped beam due to the scattering of light or light beyond a fixedamount returning from the inclined surface to the light sources.

According to the optical member 100 of the present embodiment, athickness t1 of the base substrate 10 may be about 250 μm or more andabout 500 μm or less. In this case, the optical member 100 has a plateform which makes it difficult to wind the optical member on a roll.Also, the thickness t1 of the base substrate 10 may be about tens of μmor more and about 250 μm or less. In this case, the optical member 10has a film form which makes it possible to wind the optical member on aroll. When the thickness of the base substrate 10 is smaller than about10 μm, it may be difficult to form the multiple patterns directly on onesurface of the base substrate 10, and when the thickness of the basesubstrate 10 is thicker than 500 μm, it may be difficult to implement aline shaped beam and costs for production and handling may be increased.

FIG. 3 is a view for explaining the principles of refraction andreflection of an incident beam generated from patterns of the opticalmember of FIG. 1.

Referring to FIG. 3, with regard to the multiple patterns of the opticalmember according to the present embodiment, the inclined surface 113 ofeach of the multiple patterns refracts and reflects an incident beamaccording to an incidence angle of the incident beam.

That is, when a refractive index of atmosphere or air is n1, and arefractive index is n2, light in the base substrate traveling to theatmosphere of the outside is refracted or reflected according to aninclination angle of the beam on the inclined surface 113 of each of thepatterns.

For example, when the inclination angle is identical to a predeterminedcritical angle θc of total reflection, the incident beam travels alongthe inclined surface 113, and when the inclination angle is smaller thanthe critical angle θc of total reflection, the incident beam isrefracted at a larger angle than the inclination angle from the inclinedsurface 113 according to the refractive index n2 of the base substrate,thereby traveling inside the base substrate. When the inclination angleis larger than the critical angle θc of total reflection, the incidentbeam is reflected from the inclined surface 113, thereby traveling to anupper side direction (corresponding to the first surface direction)toward which the pattern arrangement surface looks.

Of course, similarly, the light traveling from the inside of the basesubstrate to the outside is also refracted from the inclined surface 113according to the inclination angle of the light from the inclinedsurface 113 of each of the patterns, and travels to the outside or isreflected from the inclined surface 113 so as to travel in the inside ofthe base substrate 10.

FIG. 4 is a view for explaining the principles of generation of a lineshaped beam using the optical member of FIG. 1. FIG. 4 corresponds to apartially enlarged plan view of the multiple patterns 111 with regard tothe pattern arrangement surface 112 of the base substrate 10 of FIG. 2as viewed from above.

Referring to FIG. 4, with regard to the three-dimensional effect formingportion 11 provided on the first surface of the base substrate, when themultiple patterns P1, P2, P3, P4 are sequentially arranged in they-direction with respect to the light source LS, light of the lightsource LS is implemented as a line shaped beam B1 traveling in adirection crossing at right angles to respective pattern extensiondirections x1, x2, x3, x4 of the multiple patterns. This is because themultiple patterns sequentially arranged to extend in a predetermineddirection guide and concentrate the light into an optical path that canbe traversed in the least time according to the Fermat's principle thata ray of light traveling in a medium travels along a movement path thatcan be traversed in the least time.

A distance Lp (which may correspond to a pitch or an average distance)between two adjacent patterns may be about 10 to 500 μm. This distanceLp is based on a minimum distance and a maximum distance for forming aline shaped beam or a three-dimensional effect beam, and when thedistance is beyond the range, it may be difficult to implement aline-shaped beam with a three-dimensional effect.

Also, according to implementation of the line shaped beam through adesign of the multiple patterns, the multiple patterns guides the secondincident beam in a direction expect for the first path by refraction andreflection from the inclined surfaces. Here, among beams from the lightsource LS toward the inclined surfaces, the second incident beam may bea beam (hereinafter referred to as ‘an ambient beam’) that meets withthe inclined surfaces having an incidence angle corresponding to adirection (for example, a direction toward a first quadrant and a fourthquadrant of both sides of the line-shape beam in the first path thattravels to an −y axis on an x-y plan based on the light source) roughlybetween a −y direction and a −x direction, and a −y direction and a −xdirection on a plan defined by the pattern extension directions and thefirst path, and is refracted or is regularly reflected by the inclinedsurfaces. In this case, since the second incident beam is dispersed in arelatively wide range by the inclined surfaces, as viewed from anarbitrary point (a standard point, an observing point and the like) on astraight line crossing the x-y plan (corresponding to the first surfaceor the second surface of the base substrate), the second incident beambecomes ambient beams B2, B3 in which brightness of the periphery of abright part is relatively low compared to that of a line shaped beampart (hereinafter referred to as “the bright part) resulting from thefirst incident beam.

In the present embodiment, the pattern extension directions x1, x2, x3,x4 may be directions in which a specific straight line on each inclinedsurface extends, or a directions in which a specific tangent line incontact with a curved line on each inclined surface extends.

When the pattern extension directions are used, by designing therespective pattern extension directions of the multiple patterns to beparallel to each other, the light passing along the multiple patterns isexpressed as a line shaped beam with a three-dimensional effect in astraight line form in which an optical path (the first path) of thelight starts from the pattern which first meets with the light of thelight source LS and travels to the pattern positioned at the last ofsequential arrangement.

Meanwhile, when the respective pattern extension directions of themultiple patterns are designed to cross each other from at least onepoint or to extend in a radial direction so as not to be parallel toeach other (see FIG. 9), the optical path (the first path) of the lightpassing along the multiple patterns may be expressed in a curved lineform in which the optical path starts from the pattern of a point firstmeeting with light of the light source beam and is bent to a side inwhich a distance between the adjacent patterns reduces gradually.

FIG. 5 is a view showing brightness for each area resulting from theline shaped beam of the optical member of FIG. 1;

Referring to FIG. 5, with regard to the three-dimensional effect formingportion of the optical member according to the present embodiment, themultiple patterns sequentially arranged from the light sources aredivided into the patterns of three sections, and reviewing brightnessresulting from reflection and refraction of the patterns in therespective areas, each of the multiple patterns shows brightness indifferent ranges according to each distance from the light source.

In other words, when the multiple are divided into first patterns of afirst area A1, second patterns of a second area A2 and third patterns ofa third area A3 (see FIG. 2), a second brightness of the second patternsis lower than a first brightness of the first patterns and is higherthan a third brightness of the third patterns. Here, a second distanceL2 between the light source and the specific second pattern farthestaway from the light source among the second patterns is longer than afirst distance L1 between the light source and the specific firstpattern farthest away from the light source among the first patterns andis shorter than a third distance L3 between the light source and thespecific third pattern farthest away from the light source among thethird patterns.

More specifically, when a maximum brightness of the closest main patternto the light source is level 10 Lu10, the specific first main patternpositioned at the first distance L1 from the light source may have abrightness of about level 8 Lu8, level 7 Lu7, level 6 Lu6, level 5 Lu5or level 4 Lu4 according to different pattern designs of the first tofifth embodiment. The specific second main pattern positioned at thesecond distance L2 from the light source may have a brightness of aboutlevel 6 Lu6, level 4 Lu4, level 2 Lu2, or level 1 Lu1 according topattern designs. Furthermore, the specific third main pattern positionedat the third distance L3 from the light source may have a brightness ofabout level 2 Lu2, level 1 Lu1, or level 0 (no brightness).

That is, with regard to the multiple patterns previously described withreference to FIGS. 1 and 2, the respective patterns serve as indirectlight sources emitting light having a predetermined brightness value byrefracting and reflection the light of the light sources, and at thistime the multiple patterns may be implemented as indirect light sourceshaving different brightness values which are sequentially reducedaccording to a design of the patterns.

For example, as shown in FIG. 5, as shown in a brightness curve G1 of afirst embodiment, according to a predetermined pattern design of thefirst embodiment, the first patterns, the second patterns and the thirdpatterns serve as indirect light sources having brightness values ofabout level 7, level 4 and level 1, respectively. According to thisconfiguration, the multiple patterns may implement three-dimensionaleffect beams in which brightness substantially regularly reduces fromthe multiple patterns as a distance from the light sources increasesgradually. In order to implement the three-dimensional effect beams, themultiple patterns may be designed in a fixed pitch.

Also, according to a pattern design of a second embodiment, as shown ina brightness curve G2 of the second embodiment, the first patterns, thesecond patterns and the third patterns serve as indirect light sourceshaving respective brightness values of about level 6, level 3, and level0. According to such a configuration, the multiple patterns mayimplement three-dimensional effect beams in which brightnesssubstantially rapidly reduces from the multiple patterns as a distancefrom the light sources increases gradually. In order to implement thethree-dimensional effect beams, the multiple patterns may be designedsuch that as a distance from the light sources increases gradually, apitch reduces or a pattern density per a unit length increases at afixed rate.

Also, according to a pattern design of a third embodiment, as shown in abrightness curve G3 of the third embodiment, the first patterns, thesecond patterns and the third patterns serve as indirect light sourceshaving respective brightness values of about level 5, level 2, and level1. According to such a configuration, the multiple patterns mayimplement three-dimensional effect beams in which a brightness reductionrate between the first area A1 and the second area is larger than abrightness reduction rate between the second area A2 and the third areaA3 as a distance from the light sources increases gradually. In order toimplement the three-dimensional effect beams, the multiple patterns maybe designed in a fixed pitch which is narrower than the pitch of thefirst embodiment, or may be provided such that a pitch increasesgradually according to an increase in a distance from the light sourceswhile being designed in a fixed pitch which is narrower than the pitchof the first embodiment.

Also, according to a pattern design of a fourth embodiment, as shown ina brightness curve G4 of the fourth embodiment, the first patterns, thesecond patterns and the third patterns serve as indirect light sourceshaving respective brightness values of about level 4, level 1, and level0. According to such a configuration, the multiple patterns mayimplement three-dimensional effect beams in which brightness is furtherrapidly reduced relatively compared to the case of the third embodiment.In order to implement the three-dimensional effect beams, the multiplepatterns may be designed in a fixed pitch narrower than the pitch of thethird embodiment, or may be provided such that a pitch reduces graduallyaccording to an increase in a distance from the light sources whilebeing designed in a fixed pitch narrower than the pitch of the thirdembodiment.

Also, according to a pattern design of a fifth embodiment, as shown in abrightness curve G5 of the fifth embodiment, the first patterns, thesecond patterns and the third patterns serve as indirect light sourceshaving respective brightness values of about level 8, level 6, and level2. According to such a configuration, the multiple patterns mayimplement three-dimensional effect beams in which a brightness reductionrate between the first area A1 and the second area A2 is smaller than abrightness reduction rate between the second area A2 and the third areaA3 as a distance from the light sources increases gradually. In order toimplement the three-dimensional effect beams, the multiple patterns maybe designed in a fixed pitch which is wider than the pitch of the firstembodiment, or may be provided such that a pitch is gradually reducedaccording to an increase in the distance from the light sources whilebeing designed in a fixed pitch which is wider than the pitch of thefirst embodiment.

In the aforesaid first to five embodiments, it is assumed that therespective embodiments are identical to each other with respect to thepattern structures and reflection abilities of the inclined surfaces ofthe respective patterns for the respective embodiments. When there is adifference in the pattern structures and the reflection abilities amongthe patterns, by adjusting a pattern design in consideration of thisfact, three-dimensional effect beams having brightness which isnaturally reduced may be obtained by the indirect light source effectsof the multiple patterns sequentially arranged.

According to the present embodiment, thanks to the effect of thereduction in brightness and the effect of the indirect light sources ofthe multiple patterns resulting from a difference in the distance fromthe light sources, namely, a difference in optical paths,three-dimensional effect beams or line shaped beams with athree-dimensional effect can be implemented.

FIG. 6 is a view for explaining a pattern structure of the opticalmember of FIG. 1.

Referring to FIG. 6, with regard to the three-dimensional effect formingportion of the optical member according to the present embodiment, therespective patterns 111 is configured to include a triangular crosssection form. When each of the patterns 111 has the triangular crosssection structure, each of the inclined surfaces 113 has a fixedinclination angle in the y-direction of the pattern arrangement surface.In other words, each of the inclined surfaces 113 is provided to be bentto the extent of a fixed inclination angle θ with respect to thedirection (z-direction) crossing at right angles to the patternarrangement surface.

The inclination angle θ is about 5° or more and about 85° or less. Theinclination angle θ is intended to refract and reflect an incident beamBL entering from about the y-direction into roughly the z-direction orthe first surface direction or the second surface direction. When theinclination angle θ is smaller than about 5° and larger than about 85°,since refraction and reflection effects of the patterns 111 includingthe inclined surfaces 113 are insignificant, it may be difficult toimplement line shaped beams or line shaped beams with athree-dimensional effect.

Also, the inclination angle θ may be basically appropriately designed inthe range of about 5° to 85° according to a refractive index of amedium, namely, the base substrate. For example, when the refractiveindex of the base substrate is about 1.30 to 1.80, an inclination angleof the inclined surface 113 of each pattern 111 may be larger than 33.7°and smaller than 50.3°, or may be larger than 49.7° and smaller than56.3°.

Also, the base substrate or the multiple main patterns may be made of amaterial having a high refractive index. For example, a high refractiveindex polymer (n=1.80˜2.50) and the like used in manufacturing highintensity LEDs may be utilized. In this case, the inclination angle θmay be larger than 23.6° and smaller than about 56.3° according to eachrefractive index of the multiple patterns.

The inclination angle according to the refractive index is based on theSnell's law, and with reference to FIG. 3, the Snell's law isrepresented by following Equation 1.

$\begin{matrix}{\frac{\sin\;\theta_{1}}{\sin\;\theta_{2}} = \frac{n\; 2}{n\; 1}} & {{Equation}\mspace{14mu} 1}\end{matrix}$

In Equation 1, sin θ1 is a traveling angle or an incidence angle oflight shown in a first refractive index n1, and sin θ2 is an incidenceangle or a traveling angle of light shown in a second refractive indexn2.

According to the present embodiment, in addition to the inclinationangle of the inclined surface descried above, a rate of a width w to aheight h of a pitch or a bottom surface may be designed to be limited toa fixed rate. For example, when the patterns are designed so as toemphasize a cubic effect of the three-dimensional effect beams, thewidth w may be provided to be equal to or smaller than the height h.Also, when the patterns are designed so that the three-dimensionaleffect beams can express relatively long images, the width w may beprovided to be larger than the height h. Also, when each of the multiplepatterns 111 has a lenticular form, a rate (h/w) of a width to a heightof each of the multiple patterns 111 may be about ½ or less or theinclination angle may be about 45° or more. As such, in the presentembodiment, by using the width w and the height h of each pattern 111 asfactors for property adjustment, optical images of the line shaped beamswith a three-dimensional effect intended to be expressed by the opticalmember may be efficiently controlled.

In the present embodiment, the width w or a distance (which maycorrespond to a pitch) between two adjacent patterns may be 10 to 500μm. This distance may refer to an average distance among the multiplemain patterns of the first path, and may be regularly or non-regularlychanged according to each pattern design or each desired shape ofoptical images.

Meanwhile, according to the optical member of the embodiment, themultiple patterns may be configured to convexly protrude from the firstsurface or the pattern arrangement surface of the base substrate to theoutside of the base substrate, but is not limited thereto. The multiplepatterns may be configured to be concavely inserted into the inside fromthe pattern arrangement surface of the base substrate.

FIG. 7 is a view for explaining another example for the patternstructure of the optical member of FIG. 1.

Referring to FIG. 7, with regard to the three-dimensional effect formingportion 11 of the optical member according to the present embodiment,each of the multiple patterns 111 may be provided so as to have apattern structure having a semi-circular cross section or asemielliptical cross section. Also, a separation portion 102 may beprovided between two adjacent patterns.

When the multiple patterns include a first pattern Cm−1, a secondpattern Cm and a third pattern Cm+1 (wherein, m is a natural number of 2or more), the separation portion 102 may be provided between the firstpattern Cm−1 and the second pattern Cm, and between the second patternCm and the third pattern Cm+1. The separation portion, which is a gapbetween two adjacent patterns, may be provided for convenience of amanufacturing process. The separation portion 102 may be omittedaccording to a pattern design for specific implementation.

In the present embodiment, the inclined surface of each of the patterns111 becomes a surface in contact with an arbitrary point in a circulararc form of a pattern surface. A tangent line in contact with thearbitrary point on each of the patterns 111 may be placed at a fixedinclination angle θ in the direction (the z-direction) crossing at rightangles to the pattern arrangement surface 112. The inclination angle θmay be larger than 0° and smaller than 90° according to each position ofa circular cross section which the beam BL hits.

FIG. 8 is a view for explaining a further example for the patternstructure of the optical member of FIG. 1.

Referring to FIG. 8, with regard to the three-dimensional effect formingportion 11 of the optical member of the present embodiment, each of themultiple patterns 111 may be provided to have a polygonal shape. Theinclined surface 113 of each of the multiple 111 may have a broken-linegraph form.

Also, the separation portion 102 may be provided between two adjacentpatterns. When the multiple patterns include the first pattern Cm−1, thesecond pattern Cm and the third pattern Cm+, the separation portion 102may be provided between the first pattern Cm−1 and the second patternCm, and between the second pattern Cm and the third pattern Cm+1,respectively.

In the present embodiment, each of the inclined surfaces 113 of thepatterns 111 is provided so as to have multiple inclination angles θ1,θ2 according to the number of segments of the broken-line graph in thedirection (z-direction) crossing at right angles to the patternarrangement surface 112. The second inclination angle θ2 may be largerthan the first inclination angle θ1. The first and second inclinationangles θ1, θ2 may be designed within the range which is larger thanabout 5° and smaller than about 85° according to a position where thebeam BL hits.

A width w1 of the separation portion 102 is smaller than a width w ofeach of the multiple patterns in order to implement a natural lineshaped beam or a three-dimensional effect beam through thethree-dimensional effect forming portion 11. The width w1 of theseparation portion 102 may be 1/10 or less of the width of each of themultiple patterns. In order to implement line shaped beams havingdesired shapes upon designing patterns, the width w1 of the separationportion 102 may be provided to be narrow maximally or the separationportion 102 may be omitted. When the separation portion 102 is provided,the width of the separation portion 102 is designed in several μm orless.

Also, the three-dimensional effect forming portion 11 may have aninterrupted surface 115 parallel to the first surface or the patternarrangement surface 112 in the respective patterns 111. The interruptedsurface 115 is a part which does not function to enable light to besubstantially emitted to the outside. Thus, since the line shaped beamsimplemented by the multiple patterns may have an interrupted partcorresponding to the interrupted surface 115, a width w2 of theinterrupted surface 223 may be appropriately limited in a range ofseveral μm or less in order to implement line shaped beams havingdesired shapes.

FIG. 9 is a plan view of an optical member according to anotherembodiment of the present disclosure.

Referring to FIG. 9, the three-dimensional effect forming portion 11according to the present embodiment includes the multiple patternsprovided in a structure in which pattern arrangement directions crosseach other from the pattern arrangement surface of the base substrate10. The multiple patterns include a first pattern C1, a second patternC2, a third main C3, an n-second pattern Cn−2, an n-first pattern, andan nth pattern Cn in order of the location nearest to the light source.Here, n is a natural number of 6 or more.

The multiple patterns are arranged to extend in directions which are notparallel to each other. That is, with regard to the respective patternextension directions of the multiple patterns, virtual extension linesthereof may meet at one point of intersection C.

According to the present embodiment, when the light of the light sourcepasses along the three-dimensional effect forming portion 11, themultiple patterns may implement a first line shaped beam BL1 travelingalong of the first path (optical path) which is bent with a curvature toa side in which the pattern extension directions cross each other,namely, a side in the which an intersecting point C is present.

Meanwhile, according to the optical member of the present embodiment,when an observing point or a fixed standard point of an observer (aperson, a camera or the like) who observes the first line shaped beamBL1 of the first path is moved from a first point Pa to a second pointPb, the multiple patterns are operated so that a second line shaped beamBL2 of another path instead of the first line shaped beam BL1 can beobserved. This is because the position of the first path crossing atright angles to the pattern extension directions of the multiplepatterns is moved to a direction opposite to the movement direction ofthe standard point according to the movement of the standard point orthe observing point. As such, according to the position of the standardpoint or the observing point, the multiple patterns may implement theline shape beams having various optical images (a straight line form, acurved line form or a combination form thereof) traveling along thepattern extension directions of the multiple patterns.

FIG. 10 is a cross-sectional view of the optical member according to afurther embodiment of the present disclosure.

Referring to FIG. 10, an optical member 100A according to the presentembodiment is configured to include the base substrate 10, thethree-dimensional effect forming portion 11 and the reflective portion12. The three-dimensional effect forming portion 12 is provided by aseparate pattern layer 110 on the second surface of the base substrate10. The multiple patterns 111 of the three-dimensional effect formingportion 12 are provided on the second surface of the base substrate 10,and the reflective portion 12 is provided on the multiple patterns 111.

The optical member 100A of the present embodiment may be substantiallyidentical to the lighting device 100 explained with reference to FIGS. 1to 6 except for the fact that the multiple patterns 111 are provided bybonding a separate pattern layer 20 of the second surface of the basesubstrate rather than being provided by removing a part of the secondsurface of the base substrate 10, and the reflective portion 12 isprovided on the multiple patterns 111.

When the multiple patterns 111 is provided using the separate patternlayer 110, the base substrate 10 and the pattern layer 110 may have thesame refractive index. Also, according to some embodiments, the basesubstrate 10 and the pattern layer 110 may have a predetermineddifference in the refractive index. As one example, the refractive indexof the base substrate 10 may be smaller than the refractive index of thepattern layer 110 in a range of about 0.2 or less.

This difference in the refractive index is intended to prevent a designfor the inclination angle of the inclined surface of the respectivepatterns from being complicated due to the difference in refractiveindex upon designing the multiple patterns and a degree of freedom indesign from being limited.

According to the optical member 100A of the present embodiment, the lineshaped beam implemented by the multiple patterns 111 may be opticalimages expressed such that beams B11, B12, B13 having differentbrightness values gradually reduced in the areas A1, A2, A3 sequentiallyarranged from the light sources according to an increase in a distancefrom the light sources irradiating the light BL to the optical member100A, namely, an increase in optical path are irradiated to the firstsurface direction.

FIG. 11 is a cross-sectional view of a modification example for theoptical member of FIG. 10.

Referring to FIG. 11, an optical member 100B according to the presentembodiment is configured to include: the base substrate 10; an adhesivelayer 120; the multiple patterns of the three-dimensional effect formingportion 11 and the reflective portion 12. The multiple patterns 111 areprovided by the separate pattern layer 110 bonded to the second surfaceof the base substrate 10. The adhesive layer 120 is provided between thebase substrate 10 and the pattern layer 110. Furthermore, the reflectiveportion 12 is provided on one surface of the pattern layer 110 and isprovided to bury the multiple patterns 111 exposed to the second surfaceof the base substrate 10.

The optical member 100B of the present embodiment may be substantiallyidentical to the optical member 100A previously described with referenceto FIG. 10, except for the adhesive layer 120 between the base substrate10 and the pattern layer 110, and the reflective portion 12 intended forburying the multiple patterns 111.

The adhesive layer 120 may be provided using an epoxy adhesive film oran epoxy adhesive. Also, in order to adjust a difference in refractiveindex between the base substrate 10 and the pattern layer 110, theadhesive layer 120 may be made of PEA (Phenoxyethyl Acrylate) which is ahigh refractive material for adjustment of a refractive index, or may bemade a fluorinate polymer, a fluorinate monomer and the like.

A refractive index of the adhesive layer 120 may be larger than arefractive index of the base substrate 10 and a refractive index of thepattern layer 110. In this case, when a difference in the refractiveindex between the base substrate 10 and the pattern layer 110 issmaller, the light passing along the adhesive layer 120 from the basesubstrate 10 is refracted at a predetermined angle and is refracted inan opposite direction to the predetermined angle while traveling to thepattern layer 110 again, thereby traveling in a similar direction to theoriginal traveling direction. Of course, when a thickness of theadhesive layer is very thin, the refraction angle may be ignored.

Also, the adhesive layer 120 may be provided to have a predeterminedpattern according to some embodiments. In this case, along with thereflective portion 12, the adhesive layer 120 may contribute to theimplementation of optical images having various shapes by changing orlimiting the light refracted and reflected by the multiple patterns 111from the second surface of the base substrate 10.

Since the reflective portion 12 is provided to be filled in an unevenpart by the multiple patterns 111, the optical member 100 B may haveboth surfaces in a flat form. This reflective portion 12 may function toprevent the multiple patterns 111 from being damaged by an externalimpact. The optical member 100B having both surfaces in a flat form canbe easily maintained, transported and handled compared to the opticalmember of FIG. 10.

FIG. 12 is a plan view of a lighting device according to an embodimentof the present disclosure.

Referring to FIG. 12, a light device 200 of the present embodiment isconfigured to include: the optical member 100; the light source portion30; and a support member 210. The optical member 100 may be any one ofthe optical members described with reference to FIGS. 1 to 11. Theoptical member 100 has the reflective portion (see reference numeral 12of FIG. 2).

The lighting device 200 has a predetermined length LH and width WH in aplane. The length LH and the width WH may be formed similar or identicalto a length or a diameter of a 20 W fluorescent lamp or a 40 Wfluorescent lamp.

The light source portion is disposed at both ends, respectively in alength direction of the support member 210 so as to irradiate the lighthaving a light effective area of a hemispherical area toward a centralpart of the support member 210 in a rectangular bar form. The lightsource portion 30 includes a first light source and a second lightsource, and the first light source and the second light source may bedisposed so as to irradiate the light to opposite directions (+ydirection and −y direction).

Of course, the lighting device of the present embodiment may beimplemented to include the first light source and the second lightsource for irradiating the light to different directions with an angleof more than 90° and less than 180° between the first light source andthe second light source (see 30 c and 30 d of FIG. 23).

In the present embodiment, the light source portion 30 may be providedwith any one among various existing light sources such as anincandescent lamp, a halogen lamp, a discharge lamp and the like or maybe provided with a guiding or reflection member for guiding orreflecting natural light generated from the sun. Also, according to someembodiments, the light source portion 30 may be provided with lightsources including LED (Light Emitting Diode) elements. In this case, thelight source portion 30 may include LED light sources and a printedcircuit board in which a drive circuit supplying power to the lightsources is installed. For convenience of the description, a case inwhich each of the light sources of the light source portion 30 is an LEDpackage having one or two or more LED elements will be hereinafterreferred to.

The support member 210 may be at least one part of a housing of thelighting device 200, a wall inside or outside a building, or one surfaceof a specific product or an instrument. If any device or product enablesthe optical member 100 of a sheet phase to be disposed at a place wherelight of the light source portion 30 is irradiated to one side, thesupport member 210 may be implemented by the device and product withoutbeing specially limited. In addition, the support member 210 may beimplemented using a cap, clothes, shoes, a bag, an accessory, indoor oroutdoor interior components and the like.

According to the present embodiment, the light irradiated from two lightsources to a central part of the support member 210 may be implementedas two line shaped beams with a three-dimensional effect GL1, GL2 inwhich the light starts from both ends of the support member 210 byrefraction and reflection from the multiple main patterns and disappearsat the central part of the support member 210. Also, some embodiments,when the multiple effect forming portion disposed to overlap with thethree-dimensional effect forming portion is used, a single line shapedbeam with a three-dimensional effect may be converted in and displayedas multiple line shaped beams with a three dimensional effect.

That is, when the optical member 100 is disposed on the support member210, and the light is irradiated from one side of the optical member tothe optical member, the lighting device 200 implements line shaped beamsof a specific optical path via the multiple patterns of the opticalmember and implements line shaped beams GL1, GL2 with athree-dimensional effect having a perceptional depth in a verticaldirection (a direction crossing at right angles to an x-y plane) of thepattern arrangement surface through a difference in optical pathresulting from a distance from the light sources.

FIG. 13 is a plan view of a lighting device according to the otherembodiment of the present disclosure. FIG. 14 is a schematiccross-sectional view of the lighting device of FIG. 13 taken along lineXIV-XIV.

Referring to FIGS. 13 and 14, the lighting device 300 according to thepresent embodiment is configured to include a lighting plate 31; thereflective portion 12 and an optical member 100C.

The lighting plate 31 may be a separate member in a plate form and maybe connected to a device, an instrument, a building and the like or maybe provided as a part of a device, an instrument and a building. Also,the lighting plate 31 may integrally include the light source portion 30on one surface thereof. In this case, the lighting plate 31 may beconfigured to include an insulating substrate and a printed circuitboard on the insulating substrate. The lighting plate 31 may besubstantially the optical member of FIG. 12 except for the fact thelighting plate includes the printed circuit board.

In the present embodiment, the light source portion 30 includes twelvelight sources arranged in a state of being divided into two groups fromthe side parts of upper and lower sides so that the light can beirradiated from the light plate 31 to directions roughly facing eachother. Each of the light sources includes two LED elements as a singlepackage and irradiates two rays of light. Also, in the light sourceportion 30, the first light source and the second light source belonginginto the first group and the second group irradiate the beams to thesame direction or irradiate the beams from the same direction todirections crossing each other.

The reflective portion 12 is provided on one surface of the lightingplate 31 in which the light source portion 30 is disposed. Thereflective portion 12 may be substantially identical to the reflectiveportion described with reference to FIGS. 1 and 2, except for the factthat the reflective portion 12 is not integrally formed with the opticalmember 100 c.

The optical member 100C is configured to include the base substrate andthe three-dimensional effect forming portion. The configuration of theoptical member 100C may be identical to the configuration of the opticalmember described with reference to FIGS. 1 to 11 except for thereflective portion 12 as well as the element wherein the reflectiveportion 12 is not integrally included in the optical member.

However, the three-dimensional effect forming portion of the opticalmember 100C includes the multiple patterns of twelve groups provided inmultiple pattern areas corresponding to the multiple light sources ofthe light source portion 30, and the multiple patterns of the respectivegroups have pattern extension directions for limiting an optical path ofthe light sources to the first path (D1 and the like) and extending in adirection crossing at right angle to the first path.

According to the present embodiment, an optical width of the line shapedbeam may be smaller than a width of the light emitting surface of theLED light source irradiating the light to the multiple patterns of therespective areas. Here, the optical width and a width of the lightemitting surface may correspond to a maximum width for two beams BL anda width of a side of the light source portion 30 from which the light isemitted. For reference, in a case where the multiple patterns of thepresent embodiment do not exist, the light source portion may irradiatethe light having a light effective area to roughly a hemispherical areabased on the light emitting surface of the light source portion, but inthe present embodiment, the respective light sources of the light sourceportion 30 seem to irradiate the line shaped beam smaller than the widthof the light emitting surface in the light effective area due to themultiple patterns.

According to the present embodiment, when the optical member 100 isarranged on the lighting plate 31 in which the multiple LED light sourceare provided, and the light of the LED light sources is irradiated tothe optical member 100, illumination may be implemented by various lineshaped beams with a three-dimensional effect in which the light startsfrom both edges of the lighting device 300, in which the respectivelight sources are disposed, by refraction and reflection operations ofthe multiple patterns provided in the respective pattern areas of theoptical member 100 and disappears at roughly the central area A0. Inparticular, thanks to the reflection operation of the reflective portion12, the line shaped beams may be more clearly implemented compared tothe case in which the reflective portion exists.

FIG. 15 is a view showing an operational status of the lighting deviceof FIG. 13. FIG. 16 is a graph showing measured brightness of thelighting device of FIG. 15.

As shown in FIG. 15, a lighting device 300 according to the presentembodiment implements twelve line shaped beams via the patterns providedin different areas of the optical member, respectively when the light BLof twelve light sources of the light source portion 30 is irradiated tothe multiple patterns of the optical member.

Also, the lighting device 300 may implement three-dimensional effectbeams in which the light BL emitted from the light sources travels alongan arrangement direction of the multiple patterns and disappears at thecentral part (see A0 of FIG. 13) of the pattern areas in which thepatterns are arranged.

As such, the lighting device 300 may provide illumination using thethree-dimensional effect beam implemented in the optical path of arelatively very short distance (for example, about 100 to 200 mm)through a pattern design of the optical member.

Here, the very short distance may correspond to a short distance beyond‘1/(hundreds to thousands of’ times compared to a distance (for example,several meters to tens of meters) in which light is naturally reducedand disappears when the light of the LED light sources is irradiatedfrom the optical member of a comparative example in which the mainpatterns of the three-dimensional effect forming portion according tothe present embodiment are not provided.

When brightness of the lighting device 300 is measured using apredetermined brightness measuring device disposed in the central partof the lighting device, a brightness graph illustrated in FIG. 16 may beobtained.

Referring to FIG. 16, when the intensity of light of twelve lightsources is Lu12 maximally, a first brightness in the central area A0 ofthe front of the light emitting surface of the light source of thelighting device is about Lu5 which is relatively largely small comparedto a second brightness of about Lu7 to about Lu12 in the other areas.Moreover, in consideration of the fact that the first brightness in thecentral area A0 is affected by the second brightness in the other areasof the periphery, the intensity of light in the central area A0 of thelight emitting surface of the lighting device can be really predicted tobe near to Lu0 (no brightness).

According to the present embodiment, by using the line shaped beams witha three-dimensional effect of two groups extending roughly in directionsfacing each other, illumination showing high brightness at an edge partin an illumination area in a rectangular shape and low brightness at acentral part may be provided.

FIG. 17 is an operational status view of the lighting device accordingto the other embodiment of the present disclosure.

Referring to FIG. 17, the lighting device according to the presentembodiment is configured to include various LED elements regularlyarranged as light sources. Various LED elements include first LEDelements of a first arrangement line and second LED elements of a secondarrangement line, wherein a light emission direction of the first LEDelements and a light emission direction of the second LED elements areset to be opposite to each other. Furthermore, it is assumed that thefirst and second LED elements irradiate the light roughly to ahemispherical area based on the light emitting surface.

According to the aforesaid lighting device, the light of the respectiveLED elements is sequentially emitted to the outside while crossing thepattern arrangement surface of the patterns beyond a critical angle byreflection and refraction from the patterns of the three-dimensionalforming portion arranged to be sequentially far away from the respectiveLED elements. Thanks to such a configuration, the lighting device formsvarious optical images of the line shaped beam with thethree-dimensional effect via the three-dimensional forming portioncorresponding to the respective LED elements.

The line shaped beam with the three-dimensional effect expressesdifferent optical images of different optical paths according tomovement of the observing point of the observer or the predeterminedstandard point. As one example, optical images of the lighting deviceare expressed as illustrated in (a) of FIG. 17 as viewed from an upperside in a state of the lighting device being placed in a flat bottom.

That is, the optical images of FIG. 17(a) are expressed as opticalimages in which a first line shaped beam group and a second line shapedbeam group of two groups of the LED elements for irradiating the lightin opposite directions cross in directions facing each other likefolding two hands, and a crossing angle is gradually increased from acentral area to areas of both sides of the left and the right. Also, theoptical images of FIG. 17(a) are expressed so that light emitted fromthe LED elements positioned at adjacent arrangement lines according to adifference in a viewing angle with respect to the respective LEDelements has an angle (for example, about) 180°±45° beyond apredetermine part from opposite directions rather than being irradiatedin the opposite directions.

When viewing the lighting device from a front lower side near to a flatbottom where the lighting device is placed, optical images of thelighting device are expressed as illustrated in (b) of FIG. 17. That is,when the optical images of FIG. 17(b) are compared to those of FIG.17(a), the line shaped beams of the multiple LED elements in the samearrangement line appear to be separated from each other rather thanoverlapping to each other in a direction roughly vertical to the patternarrangement surface, so that the line shaped beams can be expressed asoptical images having a higher perceptional depth or a three-dimensionaleffect as a whole.

Furthermore, when viewing the lighting device from the lower part of aside close to the flat bottom where the lighting device is placed,optical images of the lighting device are expressed as illustrated in(c) of FIG. 17. That is, the optical images of FIG. 17(c) are expressedas optical images in which the rays of light in adjacent areas do notcross each other and extend in a zigzag form in multiple lines side byside as the rays of light gradually travel near to far areas.

As such, the lighting device of the present embodiment may implementdifferent optical images of different optical paths according to achange of the observing point of an observer or a predetermined standardpoint.

FIG. 18 is a partially enlarged cross-sectional view of a structurewhich can be applied to the lighting device of FIG. 17.

Referring to FIG. 18, a lighting device 300A according to the presentembodiment is configured to include: the base substrate 10 a; thethree-dimensional effect forming portion 11; the reflective portion 12;and the light source portion 30.

The base substrate 10 a is made of a material for enabling an internalincident beam to be guided. A material of the base substrate 10 a may beresin. When a resin layer is used, the base substrate 10 a may be alight guide portion having flexibility showing a thin thickness andbending.

The resin layer is basically made of a resin material which enablesguiding of light. The resin layer may be made of ultraviolet curableresin including an oligomer. Also, the resin layer may be made of resinincluding a urethane acrylate oligomer as a main material. For example,the resin layer may be produced by using the urethane acrylate oligomeras a synthetic oligomer and a polyacrylic polymer. Of course, the resinlayer may further contain a monomer mixed with IBOA (isobornylacrylate), HPA (hydroxylpropyl acrylate), 2-HEA (2-hydroxyethylarrylate) and the like which are low boiling point and diluted typereactive monomers. Also, a photo initiator or an antioxidant may befurther mixed as an additive.

The three-dimensional effect forming portion 11 is configured to includethe multiple patterns 111. Each of the multiple patterns 11 has aninclined surface, and the inclined surface is a mirror-like finishingsurface having a smooth surface roughness beyond a predetermined level.In the present embodiment, the three-dimensional effect forming portion11 is provided by a separate pattern layer 110 bonded to one surface ofthe base substrate 11 a. The other surface of the pattern layer 20 isbonded to one surface of the base substrate 11 a, and one surface of thepattern layer is a pattern arraignment surface on which the multiplepatterns 111 are provided.

The reflective portion 12 is provided as a reflective in a film form onthe pattern arrangement surface of the pattern layer 111. The reflectiveportion 12 is formed of a material having high reflection efficiency toreflect the light emitted from the light source portion 30 via thethree-dimensional forming portion 11 to the side on thethree-dimensional forming portion 21 so that light loss can be reducedand a line shaped beam having an three-dimensional effect can be moreclearly expressed.

In order to increase a reflection property of light and a dispersionproperty of light, a synthetic resin in which a white pigment isdiffused and contained may be used as a material of the reflectiveportion 12. For example, titanium oxide, aluminum oxide, zinc oxide,lead carbonate, barium sulfate, calcium carbonate and the like may beused as the white pigment. Polyethylene terephthalate, polyethylenenaphtaenate, acryl resin, poly carbonate, polystyrene, polyolefin,cellulose acetate, weather resistant vinyl chloride and the like may beused as the synthetic resin, but the present disclosure is not limitedthereto.

A separation portion 120 may be provided between the reflective portion12 and the multiple patterns 111. The reflective layer separationportion 120 may be an air gap filled with air, but is not limitedthereto. According to some embodiments, the reflective layer separationportion 120 may be filled with a material having a different refractiveindex from that of the pattern layer 20.

Also, the reflection portion 12 may be adhered to the pattern layer 110via predetermined adhesive patterns 130 upon lamination on the patternlayer 110. In this case, the reflective portion 12 may contributediversity of optical images by controlling an amount or a position oflight reflected from the reflective portion 12 according to a refractiveindex, a reflection ability of the adhesive patterns

Also, the lighting device 300A according to the present embodiment mayfurther include reflective patterns 140 on the reflective portion 12.The reflective patterns 140 may be provided on one surface of thereflective portion 12 facing the pattern layer 110 using an inkpatterns. The same material as that of the reflective portion 12 may beused as a material of the reflective patterns 140. When the reflectivepatterns 140 are used, the intensity of light reflected from thereflective portion 12 can be adjusted, thereby contributing toimplementation of optical images having various shapes.

The light source portion 30 includes light sources. Each of the lightsources may be configured to include one or two or more light emittingdiode (LED) elements. The LED element may have a side view type or anupper view type light emitting structure. Also, the light source portion30 may be configured to include a separate printed circuit board 32. Theprinted circuit board 32 may be a flexible printed circuit board inwhich conductive circuit patterns are provided on a flexible insulatingsubstrate. In the present embodiment, as viewed from a cross section ofthe light source portion, the light source of the light source portion30 may be connected to the printed circuit board 32 in such a form as topass through the pattern layer 110 and the reflective portion 12, andmay be driven so as to irradiate light to the three-dimensional formingportion 11 using power supplied through the printed circuit board 32 anda control signal.

According to the present embodiment, in the lighting device 300A, whenthe reflective portion 12 on the printed circuit board 32, the patternlayer 110 and the light sources of the light source portion 30 areburied by the base substrate 10 a provided using the resin layer, thelight of the light source portion 30 is guided by the light guideportion 10. Furthermore, when line shaped beams are expressed byreflection and refraction from the multiple patterns 111 of thethree-dimensional effect forming portion 111, the line shaped beams maybe more clearly implemented by reflection from the reflective portion12.

Also, line shaped beams having various shapes or optical images havingdesired shapes using the line shaped beams may be more efficientlyimplemented by controlling a light reflection ability or a reflectionarea of the reflective portion 12 using the reflection patterns 140 onthe reflection portion 12 or the adhesive patterns 130.

FIG. 19 is a plan view of reflective patterns which can be applied tothe lighting device of FIG. 18.

Referring to FIG. 19, according to the lighting device according to thepresent embodiment, the reflective patterns 140 may be provided in aform in which unit patterns 141 having a hexagonal ring-like shape arearranged in plural number, but is not limited thereto. For example, inaddition to the hexagonal shape, the reflective patterns 140 may bedesigned in a polygonal shape, a circular shape, an elliptical shape, astar-like shape, a winding ring-like shape, a stripe shape, a mesh shapeor a combination thereof. That is, the pattern shape of each of thereflective patterns 140 may be designed according to optical imageshaving a desired shape or desired three-dimensional effects (clearness,haziness, spreading, and the like) with respect to the optical images.

The reflective patterns 140 may be formed by performing printing with anink including a reflective material on one surface of the reflectiveportion 12.

When the reflective patterns 140 are used, by reflecting some beamstraveling to a lower side of the three-dimensional effect formingportion via the three-dimensional effect forming portion (see referencenumeral 11 of FIG. 18) from the light source 30 and returning thereflected beams to the three-dimensional effect forming portion, allbeams of the light source portion may be emitted to an upper side of thelight guide portion 10 in the first path via the multiple patterns ofthe three-dimensional effect forming portion. Also, optical images ofthe line shaped beams with the three-dimensional effect may be variouslychanged by adjusting a reflection amount or a reflection area of lightaccording to a design of the reflective pattern 140.

Meanwhile, the adhesive pattern 130 provided on one surface of thereflective portion (reference numeral 12 of FIG. 18) along thereflective pattern 140 may be provided in separate patterns whichoverlap with or do not overlap with the reflective pattern 140 withoutbeing limited thereto. According to some embodiments, the adhesivepattern 130 may be provided by containing a predetermined adhesivecomponent into the reflective pattern 140. In this case, the reflectivepattern 140 may be the adhesive pattern (see reference numeral 130 ofFIG. 18).

FIG. 20 is a partially enlarged cross-sectional view of a structurewhich can be applied to the lighting device of FIG. 17.

Referring to FIG. 20, a lighting device 300B according to the presentembodiment is configured to include: the base substrate 10 a; thethree-dimensional effect forming portion 11; the reflective portion 12;and the light source portion 30. The three-dimensional forming portion11 is provided on one surface of the separate pattern layer 110 disposedon the printed circuit board 32 of the light source portion 30.

When the multiple patterns 111 of the three-dimensional effect formingportion 11 are disposed between the pattern layer 110 and the basesubstrate 10 a, the multiple patterns 111 may not be property operatedas patterns having inclined surfaces due to a resin layer which formsthe base substrate 10 a. In particular, when the refractive index of thebase substrate 10 a is similar to that of the pattern layer 110, forexample, when a difference in the refractive index therebetween is 0.2or less, a medium boundary therebetween is unclear, and accordingly, thelight is not properly reflected from the respective inclined surfaces ofthe patterns. This shows that the light of the light source portion 30may not be guided into an upper side of the base substrate 10 a byrefraction and reflection from the multiple patterns of thethree-dimensional effect forming portion 11, and thus the line shapedbeam with a three-dimensional effect may not be implemented.

Accordingly, in the light device 300B of the present embodiment,reflective portion 12 is provided on the multiple patterns 111 providedon one surface of the pattern layer 110 such that, according to theinclination angles of the inclined surfaces of the multiple patterns 22and the incidence angles of the incident beams, the beams of the lightsource portion 30 or the incident beams traveling the inside of the basesubstrate 10 a are effectively sequentially reflected via the reflectiveportion 12 on the multiple patterns 22 to be guide to an upper side ofthe base substrate 10 a.

The reflective portion 12 is a coating layer in which the multiplepatterns 22 are thinly coated with a reflective material. Ag, Al,stainless steel (304SS) and the like may be used as a material of thereflective portion 12.

The lighting device 300B of the present embodiment is substantiallyidentical to the lighting device of FIG. 18, except for the fact thatthe multiple patterns 111 are provided between the pattern layer 110 andthe base substrate 10 a, and instead of the reflective portion in a filmform, the separation portion 120, the adhesive patterns 130 and thereflective patterns 140 of the lighting device of FIG. 18, thereflective portion 12 in a coating layer form is provided on themultiple patterns 111, and accordingly, the detailed description ofconstitutive elements identical or similar to those of the lightingdevice of FIG. 18 is omitted in order to avoid overlapping of thedescription.

The type of patterns for the multiple patterns 111 may have variousshapes such as a prism shape, lenticular shape, a tetrahedral shape, aconical shape and the like.

In the present embodiment, a thickness h2 of the lighting device 300B is100 to 250 μm or less. When the thickness of the lighting device 300B issmaller than 100 μm, it is difficult to implement LED light sources in astructure in which a resin layer is buried, and durability may bereduced. Also, when the thickness of the lighting device 300B is largerthan 250 μm, the thickness becomes thick, and accordingly, it may bedifficult to wind it on a roll.

FIG. 21 is a cross-sectional view of a lighting device according to afurther embodiment of the present disclosure.

Referring to FIG. 21, a lighting device according to the presentembodiment is configured to include: the base substrate 10; thethree-dimensional effect forming portion 11; the light source portion30; and a support member 410. The optical member 100 includes the basesubstrate 10 and the three-dimensional effect forming portion 11. Thethree-dimensional effect forming portion 11 includes the multiplepatterns sequentially arranged on the pattern arrangement surface of thebase substrate 10

The optical member 100 is provided in a film form. A thickness of theoptical member 100 is about 25 to 250 μm or less. When the thickness ofthe optical member 100 is smaller than 25 μm, it may be difficult toproduce the optical member and durability may be largely reduced. Also,when the thickness of the optical member 100 is larger than 250 μmflexibility is reduced, so that it may be difficult to install theoptical member at the support member 410 having a predeterminedcurvature.

The optical member 100 may be substantially identical to any one of theoptical members previously descried with reference to FIGS. 1 to 11,except for the fact that the optical member has a film form andflexibility. That is, in the present embodiment, as specific factorssuch as a structure of the patterns provided on the pattern arrangementsurface of the base substrate 10, and a pitch thereof and a patterndensity are appropriately designed, the optical member 100 may implementline shaped beams with a three-dimensional effect having a perceptionaldepth according to a difference in the distance from the light sourcesin the first path by specifying an optical path of light irradiated fromthe light source portion 30 to the three-dimensional effect formingportion to the first path and limiting a width of the first path.

The light source portion 30 is supported by the support member 410 andis disposed so as to irradiate light to one side of the optical member100. The light source portion 30 may be provided as an LED package or anLED string including one or two or more LED elements. When the lightsource portion includes multiple LED elements, several kinds of lightirradiated from the light source portion 30 may be displayed as multipleline shaped beams through the optical member 100.

The support member 410 may be a housing having a curvature, a wallinside or outside a building having a bent portion, or one surface of aproduct. In the present embodiment, the support member 410 has a hollowtype cylindrical shape having a predetermined diameter 2R.

If any device or product enables the optical member 100 of a sheet phaseto be disposed at a place where light of the light source portion 30 isirradiated to one side, the support member 410 may be implemented by thedevice and product without being specially limited. Furthermore, thesupport member 410 may be implemented using a cap, clothing, shoes, abag, an accessory, indoor and outdoor interior components and the liketo which the optical member 100 of the sheet phase can be attached.

According to the present embodiment, as the optical member is bonded toan application product, a product or a building having a bent portion ora curvature, illumination having various deigns may be implemented byline shaped beam or line shaped beams with a three-dimensional effect.

FIG. 22 is a plan view of a lighting device according to yet anotherembodiment of the present disclosure.

Referring to FIG. 22, a lighting device 500 according to the presentembodiment is configured to include: the optical member 100; multiplelight source portions 30 a to 30 g; an outer lens, 510.

The optical member 100 includes multiple patterns arranged in individualdirections in multiple areas 12 a, 12 f, 12 g and the like of the basesubstrate. The optical member 100 is substantially identical to any oneof the optical members previously descried with reference to FIGS. 1 to11, except for the fact that the optical member has flexibility so as tobe disposed on one surface (an inner side and the like) of the outerlens 510 having a curvature, and accordingly, the detailed descriptionthereof is omitted in order to avoid overlapping of the description.

The multiple light source portions 30 a to 30 g are disposed at an edgepart of the outer lens 510 so as to irradiate light from one side of thepatterns provided in the multiple areas of the optical member 10. Eachof the light source portions includes light sources each including oneor two or more LED elements. Also, when the lighting device 500 is usedas illumination for a car, the light sources of the respective lightsource portions may be operated by power supplied from a car battery530.

The outer lens 510 includes to a cover or a lens disposed on an outersurface of the lighting device such as a light device for a vehicle (aheadlight, a rear light and the like), an outdoor lighting device andthe like. When the lighting device is used as a car lamp, the outer lens510 may be provided on one surface, in which the optical member 100 isdisposed, so as to have a curvature leading to a curved surface of avehicle body. The outer lens 510 may be made of a transparent plasticmaterial, for example, engineering plastic and the like.

According to the present embodiment, the light irradiated from therespective light source portions is irradiated to directions (y1 to y7)toward the central part from the edge of the outer lens 510, and isexpressed as a line shaped beam or a line shaped beam with athree-dimensional effect via the patterns provided in the multiple areasof the optical member 100, respectively.

Also, as described based on the aforesaid specific embodiment (see FIG.9), the present embodiment may provide the lighting device capable ofimplementing multiple line shaped beams with three-dimensional effectsexpressed by traveling along the pattern extension directions of thepatterns in the respective areas according to the movement of a standardpoint or an observing point. That is, the lighting device 500 may beused as a car lamp such as a headlight for a car, a rear light, indoorillumination, a fog lamp, a door scarf or the like. Also, in terms of avolume, a thickness, a weight, a price, a life span, stability, a degreeof freedom in design, and easiness of installation, the lighting device500 may be usefully applied as the car lamp compared to the existing carlamps.

Meanwhile, even though the present embodiment is mainly based on thecase in which the lighting device 500 of the present embodiment is usedin a car lamp, the lighting device 500 is not limited to such aconfiguration, and may be applied to a curve portion or a bent portioninside or outside an object for illustration installation, such as abuilding, equipment, furniture and the like, as a flexible lightingdevice in a film form. In this case, the outer lens 510 may be atransparent support member or a housing for supporting the opticalmember or the light source portion.

As set forth above, some embodiments of the present disclosure mayprovide the optical member capable of implementing optical images havingdesired shapes by controlling an optical path, an optical width andluminous intensity through a pattern design to create a line shaped beamand using the line shaped beam.

According to some embodiments of the present disclosure, an entirethickness of the optical member in a film form using the line shapedbeam or the lighting device using the optical member becomes thinner sothat the optical member and the lighting device can be easily utilizedin various application products relating to illumination.

According to some embodiments of the present disclosure, the lightingdevice has flexibility by using the flexible printed circuit board andthe resin layer so that a degree of freedom in product design of thelighting device can be improved and reliability can be secured.

According to some embodiments of the present disclosure, in variousillumination fields such as general illumination, design illumination,car illumination and the like, optical images having a desiredthree-dimensional effect and various shapes can be implemented, and thelighting device can be produced in quantity at low costs.

As previously described, in the detailed description of the disclosure,having described the detailed exemplary embodiments of the disclosure,it should be apparent that modifications and variations can be made bypersons skilled without deviating from the spirit or scope of thedisclosure. Therefore, it is to be understood that the foregoing isillustrative of the present disclosure and is not to be construed aslimited to the specific embodiments disclosed, and that modifications tothe disclosed embodiments, as well as other embodiments, are intended tobe included within the scope of the appended claims and theirequivalents.

An aspect of embodiments of the present disclosure provides an opticalmember that can create a line-shaped beam by controlling an opticalpath, an optical width and luminous intensity through a pattern designand can implement optical images having a desired shape using theline-shaped beam.

Another aspect of embodiments of the present disclosure may provide anoptical member using a line shaped beam which enables an entirethickness of a device to become thinner, and a lighting device using theoptical member.

A further aspect of embodiments of the present disclosure may provide alighting device capable of improving a degree of freedom in productdesign and securing reliability as the light device including a printedcircuit board or optical member is configured to have flexibility.

Yet another aspect of embodiments of the present disclosure may providea lighting device capable of implementing optical images with athree-dimensional effect in various shapes in various illuminationfields such as general illumination, design illumination, carillumination and the like.

In order to solve the above problems, according to an aspect of thepresent disclosure, an optical member may include: a base substrate;multiple patterns sequentially arranged on a first surface of the basesubstrate and having inclined surfaces with an inclination angle withrespect to the first surfaces; and a reflective portion on the basesubstrate or the multiple patterns, wherein the multiple patternsimplement a line shaped beam of a first path crossing at right angles torespective pattern extension directions of the multiple patterns byguiding a first incident beam into a first surface direction towardwhich the first surface looks or a second surface direction toward whicha second surface of the base substrate opposite to the first surfacelooks, through refraction or reflection from the inclined surfaces.

In one embodiment, the reflective portion may be provided as a coatinglayer or a reflective film.

In one embodiment, the optical member may further include reflectivepatterns on the reflective film, adhesive patterns or a combinationthereof.

In one embodiment, a material of the reflective portion may include anyone of Ag, Al, TiO₂, CaCO₃, BaSO₄, Al₂O₃, silicon, polystyrene (PS), anda white sheet.

According to another aspect of the present disclosure, a lighting devicemay include an optical member of any one of the aforesaid embodimentsand a light source portion irradiating light to the optical member.

Any reference in this specification to “one embodiment,” “anembodiment,” “example embodiment,” etc., means that a particularfeature, structure, or characteristic described in connection with theembodiment is included in at least one embodiment of the disclosure. Theappearances of such phrases in various places in the specification arenot necessarily all referring to the same embodiment. Further, when aparticular feature, structure, or characteristic is described inconnection with any embodiment, it is submitted that it is within thepurview of one skilled in the art to effect such feature, structure, orcharacteristic in connection with other ones of the embodiments.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that numerousother modifications and embodiments can be devised by those skilled inthe art that will fall within the spirit and scope of the principles ofthis disclosure. More particularly, various variations and modificationsare possible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art.

What is claimed is:
 1. An optical member, comprising: a base substrate;a pattern layer including a plurality of patterns sequentially arrangedon a first surface of the base substrate in a first direction, and aplurality of separation portions disposed between adjacent ones of theplurality of patterns; and a reflective portion disposed directly on theplurality of patterns; wherein the plurality of patterns implement aline shaped beam of a first path crossing at right angles to respectivepattern extension directions of the multiple patterns by guiding a firstincident beam into a first surface direction toward which the firstsurface looks or a second surface direction toward which a secondsurface of the base substrate opposite to the first surface looks,through refraction or reflection from the inclined surfaces, and whereinan optical width of the line shaped beam is smaller than a width of alight emitting surface of a light source irradiating light to theplurality of patterns, and a length of the line shaped beam is largerthan the optical width; wherein a rate of a height to a width (h/w) ofthe plurality of patterns is 0.5 or less, wherein the plurality ofpatterns have a circular or elliptic shape and extend in a seconddirection which intersects to the first direction, wherein, a width ofeach of the separation portions is smaller than the width of each of thepatterns, wherein each of the separation portions has a flat surface,wherein the reflective portion includes a shape corresponding to a shapeof the plurality of patterns, and wherein a distance between twoadjacent patterns among the plurality of patterns ranges from 10 to 500μm; the plurality of patterns serve as indirect light sources in whichoptical paths become longer in order as a distance from light sourcesincreases, thereby creating a three-dimensional effect beam in athickness direction of the base substrate.
 2. The optical member ofclaim 1, wherein the reflective portion is provided as a coating layeror a reflective film.
 3. The optical member of claim 2, furthercomprising adhesive patterns formed on an adhesive layer.
 4. The opticalmember of claim 1, wherein the pattern extension directions of theplurality of patterns are parallel to each other or cross each other,and when the pattern extension directions cross each other, the firstpath is bent with a curvature to a side in which the pattern extensiondirections cross each other.
 5. The optical member of claim 1, wherein across section of the inclined surface has a straight line form, a curvedline form, a broken-line graph form or a combination form thereof. 6.The optical member of claim 1, wherein the base substrate is a lightguide portion for guiding an incident beam into an inside of the opticalmember.
 7. The optical member of claim 6, wherein a thickness of thebase substrate is 25 μm or more and less than 250 μm, or 250 μm or moreand 500 μm or less.
 8. The optical member of claim 6, wherein a materialof the base substrate is polycarbonate, polymethylmethacrylate,polystyrene, polyethylene terephthalte or glass.
 9. The optical memberof claim 1, wherein the plurality of patterns are provided by removing apart of the first surface, or are provided by a pattern layer bonded tothe first surface of the base substrate.
 10. The optical member of claim1, wherein the plurality of patterns comprise: first patternssequentially arranged and having a first optical path from the lightsources; second patterns having a second optical path longer than thefirst optical path; and third patterns having a third optical pathlonger than the second optical path, wherein a second distance from asecond dummy light source of the light source by inclined surfaces ofthe second patterns to inclined surfaces of the first patterns is longerthan a first distance from a first dummy light source of the lightsource by the inclined surfaces of the first patterns to the inclinedsurfaces of the first patterns and is shorter than a third distance froma third dummy light source of the light source by inclined surfaces ofthe third patterns to the inclined surfaces of the first patterns. 11.The optical member of claim 1, wherein the plurality of patternsimplement a line shaped beam displayed by traveling along the patternextension directions in a direction opposite to a movement direction ofa standard point or an observing point according to movement of thestandard point or the observing point.
 12. A lighting device,comprising: an optical member of claim 1; and a light source portionirradiating light to the optical member.
 13. The lighting device ofclaim 12, wherein the light source portion comprises a first lightsource and a second light source, wherein the first light source and thesecond light source irradiate the light to the same direction orirradiate the light from the same direction to directions crossing eachother.
 14. The lighting device of claim 12, wherein the light sourceportion comprises a first light source and a second light source, wherethe first light source and the second light source irradiate the lightto opposite directions, or irradiate the light to different directionshaving an angle of more than 90° and less than 180° between the firstlight source and the second light source.
 15. The lighting device ofclaim 12, wherein the light source portion comprises LED (Light EmittingDiode) elements as light sources and a printed circuit board connectedto the light sources and irradiates light to a hemispherical area of thefront of a light emitting surface based on the light emitting surface ofthe light sources, and the optical member implements a line shaped beamin the hemispherical area.
 16. The lighting device of claim 12, furthercomprising a base member disposed on the optical member and covering thelight source, wherein the optical member includes the plurality ofpatterns facing a substrate, and the substrate has a refractive indexthat is lower than a refractive index of the plurality of patterns.